First disappointment, the product arrived to me dissolved (not from transportation), as shown in the above photo. I had to unscrew it to fix it myself!!! The Slow Fast button is basically On-Off and the red button (which you think is On-Off) is start stop motion. The designs are plenty and it looks beautiful. I received it today, so I haven't tried it enough to say more.
After using it for a while, it works well and the kids loved it, but some slides are upside down (it seems like you can fix it if you mess with it and unscrew the slide and turn the image, I haven't dealt with it yet) and if it moves, the lenses detach like in the initial photo when it arrived... overall, as a construction, it is very cheap, but it seems to work well and it is impressive!!!